I'm playing New Vegas on my PC. I want to redirect the audio to my monitor's speakers while my default audio device is set to my TV. I couldn't find anything in the options, is there somewhere else I can specify which audio device New Vegas uses?
You can use a tool called "Virtual Audio Cable" which is capable of rerouting any audio source on your PC. It is paid, but the trial allows you up to 2 virtual cables:
Another one claims to be free, but I didn't try it yet so I cannot comment it's quality: